/**
 * Example of using GPU JIT functionality when bpftime attaches to a CUDA program
 * 
 * This example shows how to schedule code replacement for GPU kernels
 * when using bpftime to attach to a running CUDA application.
 */

#include "gpu_jit_api.hpp"
#include <iostream>
#include <string>

using namespace bpftime::attach;

// Example optimized PTX code for a vector addition kernel
const char* optimized_vector_add_ptx = R"(
.version 7.0
.target sm_60
.address_size 64

.visible .entry vectorAdd_optimized(
    .param .u64 vectorAdd_param_0,
    .param .u64 vectorAdd_param_1,
    .param .u64 vectorAdd_param_2,
    .param .u32 vectorAdd_param_3
)
{
    .reg .f32   %f<4>;
    .reg .b32   %r<8>;
    .reg .b64   %rd<11>;

    ld.param.u64    %rd1, [vectorAdd_param_0];
    ld.param.u64    %rd2, [vectorAdd_param_1];
    ld.param.u64    %rd3, [vectorAdd_param_2];
    ld.param.u32    %r2, [vectorAdd_param_3];
    mov.u32         %r3, %ctaid.x;
    mov.u32         %r4, %ntid.x;
    mov.u32         %r5, %tid.x;
    mad.lo.s32      %r1, %r4, %r3, %r5;
    setp.ge.u32     %p1, %r1, %r2;
    @%p1 bra        BB0_2;

    // Optimized: Use vector loads for better performance
    cvt.s64.s32     %rd4, %r1;
    shl.b64         %rd5, %rd4, 2;
    add.s64         %rd6, %rd1, %rd5;
    add.s64         %rd7, %rd2, %rd5;
    add.s64         %rd8, %rd3, %rd5;
    
    // Load with prefetch hint
    ld.global.ca.f32 %f1, [%rd6];
    ld.global.ca.f32 %f2, [%rd7];
    
    // Use FMA for better performance
    fma.rn.f32      %f3, %f1, 1.0, %f2;
    st.global.f32   [%rd8], %f3;

BB0_2:
    ret;
}
)";

// Example self-modifying kernel that changes based on data
const char* adaptive_kernel_ptx = R"(
.version 7.0
.target sm_60
.address_size 64

.visible .entry adaptiveKernel(
    .param .u64 data_param,
    .param .u32 size_param,
    .param .u32 iteration_param
)
{
    // Kernel that adapts its behavior based on iteration count
    .reg .f32   %f<10>;
    .reg .b32   %r<10>;
    .reg .b64   %rd<10>;
    
    ld.param.u64    %rd1, [data_param];
    ld.param.u32    %r1, [size_param];
    ld.param.u32    %r2, [iteration_param];
    
    // Different computation paths based on iteration
    setp.lt.u32     %p1, %r2, 100;
    @%p1 bra        SIMPLE_PATH;
    
    // Complex computation for later iterations
    // ... complex operations ...
    bra             END;
    
SIMPLE_PATH:
    // Simple computation for early iterations
    // ... simple operations ...
    
END:
    ret;
}
)";

void demonstrateGPUJIT() {
    // Get the GPU JIT API instance
    auto& gpuJIT = GPUJITApi::getInstance();
    
    std::cout << "GPU JIT API Usage Example\n";
    std::cout << "========================\n\n";
    
    // Example 1: Schedule immediate code replacement
    std::cout << "1. Scheduling immediate code replacement for vectorAdd kernel\n";
    gpuJIT.scheduleCodeReplacement("vectorAdd", optimized_vector_add_ptx, -1);
    
    // Example 2: Schedule code replacement after 1000 iterations
    std::cout << "2. Scheduling code replacement after 1000 iterations\n";
    gpuJIT.scheduleCodeReplacement("matrixMul", adaptive_kernel_ptx, 1000);
    
    // Example 3: Enable periodic checkpointing
    std::cout << "3. Enabling checkpointing every 5 seconds for critical kernel\n";
    gpuJIT.enableCheckpointing("criticalKernel", 5.0);
    
    // Example 4: Restore from a checkpoint
    std::cout << "4. Restoring from checkpoint\n";
    gpuJIT.restoreCheckpoint("checkpoint_criticalKernel_1");
    
    std::cout << "\nNote: These calls will only work when bpftime is attached to a CUDA process\n";
}

// This would typically be called from within a bpftime attach script or plugin
int main() {
    std::cout << "GPU JIT Usage Example for bpftime\n";
    std::cout << "=================================\n\n";
    
    std::cout << "This example shows how to use the GPU JIT API when bpftime\n";
    std::cout << "is attached to a CUDA application.\n\n";
    
    std::cout << "Usage:\n";
    std::cout << "1. Attach bpftime to a CUDA process\n";
    std::cout << "2. Call GPUJITApi methods to schedule code replacement\n";
    std::cout << "3. The replacement will happen when the kernel is launched\n\n";
    
    demonstrateGPUJIT();
    
    return 0;
}